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the amount of matter an object contains


a push, pull, or any action which has the ability to change motion


everything that has mass and takes up space

phases of matter

the different forms matter can take; solid, liquid, and gas

chemical change

a chemical change transforms one kind of matter into another kind which may have different properties


the amount of space between two points

astronomical unit (AU)

the distance between Earth and the Sun

light year

the distance light travels in one year

natural laws

the set of rules that are obeyed by every detail of everything that occurs in the universe


a process of learning that starts with questions and proceeds by seeking the answers to the questions


to figure something out from known facts using logical thinking


a scientific explanation supported by much evidence collected over a long period of time


an unproved or preliminary explanation that can be tested by comparison with scientific evidence. An educated guess of how you think two variables are related

scientific method

a process of learning that begins with a hypothesis and proceeds to prove or change the hypothesis by comparing it with scientific evidence


describes evidence that documents only what actually happened as exactly as possible


describes evidence that can be seen independently by others if they repeat the same experiment or observation in the same way

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